表语从句
表语芋头梗从句
一、定义：
1.表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。
Eg:The problem is puzzling. 这问题令人困惑
主语 连系动词 形容词作表语
The problem is when we can get a pay rise. 问题是什么时候我们可以得到加薪.
主语 连系动词 一个句子作表语---表语从句
2.连接表语从句的连接词有：that, what, who, when, where, which, why, whether,how.
He has become a teacher. 他已经成为一名教师。
He has become what he wanted to be ten years ago. 他已经成为了他10年前想成为的。
She has remained there for an hour.诗经赏析 她曾在那里停留了一个小时。
She has remained where I stood yesterday for an hour. 第三势力她一直在我昨天站的地方站了一个小时。
why he cried yesterday. 昨天他为什么哭。
how I can persuade her to join us in the party. 我怎么能说服她加入我们的派对。
whether the enemy is marching towards us. 是否敌人正向我们行进.
二 注意：
1.表语从句一定要用陈述语序。
有勇有谋的意思 False: The question is when can he arrive at the hotel.
Right: The question is when he can arrive at the hotel.
2.不可以用if，而用whether 连接表语从句(as if 例外）。
引导宾语从句时可以互换if/whether 位于介词后要用whether ,位于句首时要用whether
引导表语从句，主语从句，同位语从句时要用whether
False: The question is if the enemy is marching towards us.
Right: The question is whether the enemy is marching towards us.
Right: It looked as if he had understood this question.
Right: The question is who will travel with me to Beijing tomorrow.
Right: The question is why he cried yesterday.
4.that在表语从句中不可以省掉。
表语从句的基本用法:
表语从句只能置于主句之后，而主句的动词只能是联系动词。
名词性从句在be等系动词后作表语时被称为表语从句.
例如： The problem is how we can get the things we need. (how 在表语从句中充当方式状语)
问题是我们怎样能弄到我们需要的东西。
The scissors are not what I need. (what 在表语从句中充当宾语)
这把剪刀不是我所需要的。
What I told him was that I would find him a good play.
我告诉他的是我会给他个好剧本。(what在主语从句中作直接宾语， that作为表语从句的引导词在该表语从句中不充当句子成分， 不能省略)
That is why she failed to pass the exam. (why 在表语从句中充当原因状语)
那就是她考试不及格的原因。
注意： “That ”是常用句型， 意为“这就是……的原因/因此……”， 其中why引导的名词性从句在句中作表语， 该句型通常用于针对前面已经说明过的原因进行总结，又如： That is why you see this old woman before you know, Jeanne. (前文提到Jeanne对老妇人显得苍老憔悴深感诧异， 说话人对她讲述了其中的原因之后，用这一句来进行概括)。
That is why I came. 这就是我来的原因。
下面是两个与“That ”形式相似的结构， 它们与“That ”结构之间的关系要能够辨析清楚：
(1)“That ”与“That is the ”同义， 只不过从语法结构上讲， “That is the ”中why引导的是—个定语从句，将其中的the reason去掉则与“That ”结构一样， 例如：
That is (the reason) why I cannot agree. 这就是我不能同意的理由。
(2)“That ”句型中从属连词because引导的名词性从句在此作表语， 这也是个常用句型， 意为“这就是为什么……/因为……”。“That ”与“That ”之间的不同在于“That ”指原因或理由， “That ”则指由于各种原因所造成的后果， 例如：
He did not see the film last night. That is because he had to help his little sister with her homework.昨天晚上他没有去看电影， 那是因为他得帮助他的妹妹做作业。(第一句话说明结果， 第二句话说明原因)
He had seen the film before. That is why he did not see it last night.他以前曾看过那部电影， 因此他昨天晚上没有去看。(第一句话说明原因， 第二句话说明结果)洗浴中心项目
例题精析：
［考题1］ The traditional view is ____ we sleep because our brain is “programmed” to make us do so. (2007上海)
A. when B. why C. whether D. that
［答案］ D
［考题2］ You are saying that everyone should be equal, and this is ____ I disagree. (2004)
A. why B. where C. what D. how
［答案］ B
［考题3］ — I drove to Zhuhai for the air show last week.
— Is that ____ you had a few days off? (1999)
A. why B. when C. what D. where
［答案］ A
［考题4］ ____ she couldn’t understand was ____ fewer and fewer students showed interest in her lessons. (2000上海)
A. What; why B. That; what C. What; because D. Why; that
［答案］ A
［考题5］ ____ made the school proud was ____ more than 90% of the students had been admitted to key universities. (2003上海春)
A. What; because B. What; that
C. That; what D. That; because
［答案］ B
［考题6］ — Are you still thinking about yesterday’s game?
— Oh, that’s ____. (2003北京春)
A. what makes me feel excited B. whatever I feel excited about
C. how I feel about it D. when I feel excited
［答案］ A
表语从句与宾语从句的关系
宾语从句和表语从句都属于名词性从句。其作用跟名词在句中的作用相同。故充当宾语的句子叫宾语从句，充当表语的句子叫表语从句。
宾语从句
(1)对于宾语从句要掌握以下三点
①语序: 从句的语序必须是陈述句语序, 即“主语 + 谓语”这种形式。
②时态: 当主句是一般现在时或一般将来时的时候, 从句可以是任何时态, 而当主句是一般过去时的时候, 从句, 从句时态必须是过去时范围的时态, 即(一般过去时, 过去进行时, 过去完成时, 过去将来时)。
③连接词: 当从句意思完整, 主句意思肯定时, 连接词用that, 且可以省去, 当从句意思完整, 主句意思不确定或含否定含意时, 常用if或whether(是否), 当从句意思不完整时, 连接词则是
代替不完整部分的特殊疑问词。
表语从句
在句子中起表语作用的从句叫做表语从句，位于主句系动词的后面。表语从句的引导词和主语从句的引导词相同。也是名词性从句的一种。
如： What the police want to know is when you enred red the room警察想知道的是你什么时候进的房间。
His His first question was whether Mr. Smith had arrived yet他的第一个问题是史密斯先生到了没有。
whether是什么意思
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